
/**
 * Copyright 2009 cestum.org
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
package org.waveprotocol.wave.model.document.operation.algorithm.transformer {
final class DeleteCharactersCache extends RangeCache {
	
	private var characters:String;
	var parent:Target;
	function DeleteCharactersCache(t:Target, characters:String) {
		this.characters = characters;
		this.parent = t;
	}
	
	
	override function resolveRetain(itemCount:int):void {
		parent.doDeleteCharacters(characters.substring(0, itemCount));
		characters = characters.substring(itemCount);
	}
	
	
	override function resolveDeleteCharacters(characters:String):void {
		parent.dualDeletion();
		this.characters = this.characters.substring(characters.length);
	}
	
}
}